Improvement in grates for furnaces



J. DODGE & T. E. COLES.

GRA-TES FOR FURNACES Patented June 27,. 1876. 12;].

INVE/V 70 R6 MPETERS. PHOTQ-LIYHOGRAPHER, WASHINGTON. D. C.

earns FFIGE.

E ATENT JOHN DODGE AND I THOMAS E. OOLES, OF LONDON, ENGLAND, ASSIONORSTO CHAR-LES MARTIN STOER AND THOMAS EDGHILL OOLES, OF SAME PLACE.

IMPROVEMENT IN GRATES FOR FURNACES.

Specification forming part of Letters Patent No. 179,283, dated June 27,1876; application filed May 6, 1876.

is an end elevation, and Fig. 4 is a transverse section on the line :2000, Fig. 1.

Like letters indicate the same parts throughout the drawings.

a is the ordinary flue. b b are cross frames or bearers for the improvedfurnacebars 0. c is the body or belly of the bar; 0 0 the teethserrations or projections on both sides and c c the ends, which lastare, on their under sides, rounded or curved, and so lie incorrespondingly-shaped seats prepared for them in the bearers b as torock freely therein.

The inclination of the teeth serrations or projections 0 andconsequently of the airpassages between them, is specially to be noted,the current being from the front toward the back of the boiler.

A dead-plate may be adapted to receive and support the nearer ends ofone nest or set of furnace-bars, instead of one of the bearers b, or thebearer may be adapted to support the plate.

Bearings e are fixed to the under side of two of the bearers b, forsupporting a shaft, f, for moving the bars 0, which shaft may be rockedor turned in alternate directions by a hand-lever, or by other suitablemeans.

9 g are two toothed sector-wheels or pinions on the shaft f. h h areagitators,operated by the pinions g. These agitatops are movablecastings or pieces prepared for and resting upon and supported bybracket-rollers; t',

which are themselves fixed to the sides of the side bars, therebyavoiding the necessity for drilling any holes in the flue, which is amatter of great importance, and whichhas heretofore been eifected withother arrangements of rocking fire-bars.

Each agitator has teeth h on its under side engaging with those of itspinion g. It also has nicks or grooves on the upper side, within whichlie the lower edges of bellies c of the furnace-bars, which enter thesenicks without disturbing the proper bearings of the ends 0 in theirseats upon the frames 1).

It will be obvious that a to-and-fro motion given to the agitators willeffect the rocking or turning of the bars on their longitudinal axes.

Fig. 4 shows the bars nearly at their extreme angle of turning ortilting in onedirection, and the other working or moving parts of theapparatus with their corresponding position. 4

It is evident that, by their movementin opposite directions alternately,and in consequence of the inclined teeth serrations or projections ofthe bars lying within or opposite to the spaces between those of theadjacent bars, the said bars will act as pokers and crushers to eachother, and will bring down the cindets, which otherwise would becomeclinkers,

. and which can therefore be collected and returned to the furnace.

All of the furnace-bars are made alike and interchangeable, exceptingthe outside furnace-bars, which have their ends 0 flat on the underside, and do not rock, tilt, or turn like the others.

The shaft f and pinions 9, arranged either substantially as herein setforth, and for the in the center or at the side of the furnace, purposespecified.

and the agitators h, constructed as herein de- JOHN DODGE.

scribed, and supported in roller-bearings i, THOMAS EDGEULL OOLES. whosebrackets are fixed on the side bars, in Witnesses:

combination with furnace-bars whose ends ERNEST ISAAC,

are fitted to rock or turn in suitable bearings, WALTER EDWARD DUNCAN.

